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Case Tractors Discussion Forum

Converting 300 to 12 volt

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hobbyfarmerinwi

01-19-2008 19:50:11

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According to my "to do" list to convert my 1957 Case 311B, I need to install a ballast resistor on the coil if you have a battery ignition.

I have no idea what that means, or if I have one.

Do I replace the 6 volt coil? If so, can I replace it with any 12 volt coil that fits the space the old one sits in?

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Joe (Wa)

01-19-2008 22:23:14

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Re: Converting 300 to 12 volt in reply to hobbyfarmerinwi, 01-19-2008 19:50:11

311B was built in 1958 & 1959 model years only. I have never seen a 311B that was not factory 12v, there are no 6v parts listed in my 300B Case parts manual either.

I guess the question is: If you have a 311B are you sure it is not already 12v or are you just swapping the generator for an alternator.

Check the tag on the starter & generator if they still exist.

Joe

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hobbyfarmerinwi

01-20-2008 04:05:54

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Re: Converting 300 to 12 volt in reply to Joe (Wa), 01-19-2008 22:23:14

Joe, I must have the 311B part wrong. It is a 1957, Roundnose 300, gas, with the triple range trans, Eagle hitch.

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Joe (Wa)

01-20-2008 10:33:28

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Re: Converting 300 to 12 volt in reply to hobbyfarmerinwi, 01-20-2008 04:05:54

Ok, 300 round nose series were built 1956 & 1957 model years. They were factory 6v pos ground so follow what Jim said.

Most off the shelf alternators are negative ground, if your tractor is still factory wired you will need to swap the polarity on the replacement 12v battery and on the coil.

Your gas gauge is also 6v, you may want to wire a 12v-6v voltage reducer in the lead to the power terminal. You can buy that at an auto parts store.

Joe

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Jim McVay

01-19-2008 19:58:43

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Re: Converting 300 to 12 volt in reply to hobbyfarmerinwi, 01-19-2008 19:50:11

It is easier to replace the 6 volt coil with a 12 volt internal resitored coil. I think the NAPA # is a IC14. Or you can buy a resitor designed to do the same and reuse your 6 volt coil. You will also need to remove the generator and add a 12 volt alternator and change the light bulbs to 12 volt bulbs

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hobbyfarmerinwi

01-19-2008 20:01:32

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Re: Converting 300 to 12 volt in reply to Jim McVay, 01-19-2008 19:58:43

Thanks,

I am following the "how to" I found on this site from quite some time ago.

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